<?php

namespace Framework;

use App\Controllers\ErrorController;
use Framework\Middleware\Authorise;

class Router {
    protected $routes = [];

    /**
     * 注册一条路由规则
     * 
     * @param string $method
     * @param string $uri
     * @param string $action
     * @param string $middleware 
     * @return void
     */
    private function registerRoute($method, $uri, $action, $middleware = []) {

        list($controller, $controllerMethod) = explode('@', $action);

        $this->routes[] = [
            'method' => $method,
            'uri' => $uri,
            'controller' => $controller,
            'controllerMethod' => $controllerMethod,
            'middleware' => $middleware
        ];
    }

    /**
     * 添加一个 GET 路由
     * 
     * @param string $uri
     * @param string $controller
     * @param array $middleware
     * @return void
     */
    public function addGet($uri,$controller, $middleware = []) {
        $this->registerRoute('GET',$uri,$controller, $middleware);
    }

    /**
     * 添加一个 POST 路由
     * 
     * @param string $uri
     * @param string $controller
     * @param array $middleware
     * @return void
     */
    public function addPost($uri,$controller, $middleware = []) {
        $this->registerRoute('POST',$uri,$controller, $middleware);
    }

    /**
     * 添加一个 PUT 路由
     * 
     * @param string $uri
     * @param string $controller
     * @param array $middleware
     * @return void
     */
    public function addPut($uri,$controller, $middleware = []) {
        $this->registerRoute('PUT',$uri,$controller, $middleware);
    }

    /**
     * 添加一个 DELETE 路由
     * 
     * @param string $uri
     * @param string $controller
     * @param array $middleware
     * @return void
     */
    public function addDelete($uri,$controller, $middleware = []) {
        $this->registerRoute('DELETE',$uri,$controller, $middleware);
    }

    /**
     * 加载错误页面
     * @param int $httpCode
     * @return void
     */
    public function error($httpCode = 404)
    {
        http_response_code($httpCode);
        loadView("error/{$httpCode}");
        exit;
    }

    /**
     * 执行路由
     * @param string $uri
     * @return void
     */
    public function route($uri){

        $requsestMethod = $_SERVER['REQUEST_METHOD'];

        if ($requsestMethod === 'POST' && isset($_POST['_method'])) {
            $requsestMethod = strtoupper($_POST['_method']);
        }

        $uriSegments = explode('/', trim($uri, '/'));

        foreach($this->routes as $route){

            $routeSegments = explode('/', trim($route['uri'], '/'));

            $match = false;

            if (count($uriSegments) === count($routeSegments) && strtoupper($route['method'] === $requsestMethod))
            {
                $params = [];

                $match = true;

                for ($i = 0; $i < count($uriSegments); $i++) {
                    if ($routeSegments[$i] !== $uriSegments[$i] && !preg_match('/\{(.+?)\}/', $routeSegments[$i])) {
                        $match = false;
                        break;
                    }

                    if (preg_match('/\{(.+?)\}/', $routeSegments[$i], $matches)) {
                        $params[$matches[1]] = $uriSegments[$i];
                    }
                }

                if ($match) {

                    foreach($route['middleware'] as $middleware) {
                        (new Authorise())->handle($middleware);
                    }
                    
                    $controller = 'App\\Controllers\\' . $route['controller'];
                    $controllerMethod = $route['controllerMethod'];

                    $controllerInstance = new $controller();
                    $controllerInstance->$controllerMethod($params);
                    return;
                }
            }
        }
        ErrorController::notFound();
    }
}
